/Engine/Source/Runtime/Engine/Classes/GameFramework/RootMotionSource.h
Get a RootMotionSource from this Group by ID
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FRootMotionSource](API\Runtime\Engine\GameFramework\FRootMotionSource) > GetRootMotionSourceByID ( uint16 RootMotionSourceID )